[MIPS64] Add build support for MIPS64 in libjpeg_turbo.

BUG=400684

Review URL: https://codereview.appspot.com/143920043

git-svn-id: http://src.chromium.org/svn/trunk/deps/third_party/libjpeg_turbo@291962 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
diff --git a/libjpeg.gyp b/libjpeg.gyp
index e20b0d9..c5d8dce 100644
--- a/libjpeg.gyp
+++ b/libjpeg.gyp
@@ -186,7 +186,7 @@
             'simd/jsimd_arm64_neon.S',
           ],
         }],
-        [ 'target_arch=="mipsel"', {
+        [ 'target_arch=="mipsel" or target_arch=="mips64el"', {
           'sources': [
             'jsimd_none.c',
           ],